Method of welding.



PATENTED APR. 18', 1905.

o. EIGEN.

l METHOD 0E WELDING.

APPLICATION FILED MAY 12, 1902.

UNITED 'STATES Patented April 18, 1905,

PATENT OFFICE.

OTTO EIGEN, OF DUISBURG, GERMANY, ASSIGNOR TO DUISBURGER MA-SOHINENBAU-AOTIEN-GESELLSOHAFT, VORMALS BEOHEM & KEETMAN,

OF DUISBURG, GERMANY.

METHOD OF WELDING.

SPECIFICATION forming part of Letters Patent No. 787,742, dated April18, 1905.

Application filed May 12, 1902. Serial No. 106,889.

To @ZZ zzz/2,0m it may concern i B e it known that I, OTTO EIGEN,engineer, a subject of the Emperor oi Germany, residing at l2Brauerstrasse, Duisburg, in the Empire 5 of Germany, have invented acertain new and usefullmproved Method of Welding, of whichthe followingis a specification.

This invention relates to an improved method of welding together theends of bars,

o rails, rings, and the like.

----.ll`he process is especially adapted for the manufactureof weldedchains. Its novelty resides in the fact that the two extremities of achain-link, of two bars, rails, or the like 5 which are to be weldedtogether and which have been heated to welding heat are submitted to theaction oi two pressure-rolls rotating in the same direction in such amanner that the said extremities which are to be o united are pressedone against the other both in the longitudinal direction of the bar andalso transversely of the same. These pressure-rolls may act upon thejoint either with equal or unequal circumferential velocities.

1 5 If the velocities o the two rolls are different, the parts to bewelded together will not only be pressed together, but the work will atthe same time be advanced between the rolls. It' desired, thisdisplacement of the work may ;0 be etfected mechanically by any othersuitable means.

The rolls, which with the arrangement dea and L both run in the samedirection, as indicated by the arrows 1 and 2. The tendency of the rollZ) is to displace the parte in the direction of the arrow 3, while thetendency of the roll a is to displace the part d in the direction of thearrow 4. By this means the two parts are firmly pressed one against theother, so that owing to the pressure exerted by the rolls the parts willbe thoroughly welded together, it being of course understood that bothends have previously been raised to welding heat. The rolls-also exert apressure upon the work transversely to the longitudinal direction of theweld, thereby greatly improving the welding operation, and athoroughly-reliable weld is always produced. The parts to be welded maybe heated by means of a smiths lire 6r by any other suitable means inthe known manner.

If shaped bars are being treated, the section of the rolls mayadvantageously correspond with that of the bars, as thereby the properform is at once given to the welded portion. The rolls are also adaptedfor working the rest of lthe bar, thus'improving the quality of thematerial and exactly calibrating the welded object throughout its entirelength.

As is well known, welding heat causes the material to lose its fibrousquality. This quality may, however, be restored to it by the rollingwhich follows the welding operation. If the two rolls a and are causedto rotate with different circumferential velocities, but in the samedirection, the welding and pressing operations take place exactly in themanner described above, except that owing to the difference of velocitydisplacement of the work takes place, so that the weld passes betweenthe rolls. The arrangement may also be such that upon the termination ofthe welding and pressing operations one of the two rolls is eitherreleased or caused to rotate in the reverse direction, thus-effectingthe ordinary rolling operation. This is advantageous in the manufactureof chain-links, for example, which process is illustrated in Fig. 2 ofthe drawings.

In effectingl the welding of chain-links in accordance with thisinvention, as illustrated the link.

in Fig. 2, the link of, the two extremities C, and D of which are to beunited, is acted upon by a small roll B, which is passed through Forthis roll B may be substituted a mandrel-roller journaled at oneextremity only. During the operation the link 7 may be guided bysuitable guide-rolls g and L. The continuous pressure between the rollsA and B in the directions indicated forces the ends C and D integrallytogether, thus forming a neat and strong weld. In this case also thepressing and welding of the two ends C and D takes place owing to thefact that the two rolls A and B rotate in the same direction. 4Aftersome time the aforesaid small roll B is either released or caused torotate in the reverse direction, whereupon the whole link is rolled,thus improving the quality of the material by giving it a constantuninterrupted fibrous formation throughout its whole circumference,while at the same time calibration is effected and the surface of thering is rendered. compact, hard,and smooth, thus greatly increasing' itsstrength. The treatment of the link after welding may be continued untilthe lowest limit of temperature is reached at which said link can begiven its oval form. During this operation of pressing the link oval atransverse stay or member may be inserted, if desired. In this mannerchains with oval links or with transverse stays may be manufactured withonly one heating of each link. rIhe welding operation and the whole ofthe subsequent treatment of the link may be carried out with oneheating.

It will be observed that with the rolls a (shown in Figs. l and 2)rotating in the direction indicated the' beveled surfaces to be Weldi edare forced together by rolling pressures of i contrary direction. Theresult is that the welded surfaces are squeezed together in onedirection by the direct pressure of the rolls and are also forcedtogether in a direction at right angles to the direction just mentionedby the rotative effect of the roll. If, however,the direction of one ofthe rolls is changed, the beveled surfaces will still be squeezedtogether by the direct pressure of the rolls, but will not be forced inopposite directions along the path of travel of the body to be welded.

What I claim, and desire to secure by Letters Patent of the UnitedStates, isV

l. The method herein described of welding by means of rolling pressures,which consists in providing the members to be welded with bevels,heating said members, placing said bevels together face to face, andsubjecting said members to rolling pressures which force said membersdirectly toward each other in two independent directions crossing thegeneral direction of the bevels.

2. The method herein described of welding by means of rolling pressures,which consists in providing the articles with oppositely-dis posedmembers having bevels, placing said members toward each other in twoindependent directions crossing the general planes of said bevels. Intestimony whereof I have hereunto set my hand, in presence of twosubscribing witnesses, this 23d day of April, 1902.

' OTT() EIGEN.

Witnesses:

WILLIAM EssnNwniN, PETER LI nenn.

bevels in contact face to face, and forcing said i

